The chain of events that led to the discovery of the most wanted man in America began around 6 p.m., when Massachusetts Gov. Deval Patrick lifted the Boston lockdown and ordered the restart of mass transit.

At approximately 7 p.m., Henneberry took advantage of the lifted lockdown and entered his backyard to walk his dog. Henneberry noticed something amiss with his prized boat, according to Henneberry's neighbor, George Pizzuto.

"He looked and noticed something was off about his boat, so he got his ladder, and he put his ladder up on the side of the boat and climbed up," Pizzuto said. "And then he saw blood on it, and he thought he saw what was a body laying in the boat. So he got out of the boat fast and called police."

Moments after the discovery, Henneberry apparently notified authorities about the bloody body. Police converged on his home on Franklin Street in Watertown with their guns drawn. Gunfire erupted and dozens of law enforcement officers rushed to secure a perimeter around the home, where residents were immediately warned to stay indoors and "shelter in place."

Pizzuto said that Henneberry was rushed to his home and was interviewed by police after they arrived on the scene. Pizzuto said Henneberry was "totally distraught" as the SWAT team and other police officials continued to question him.

While he was being interviewed, the power to Henneberry's home was cut for unknown reasons.

"That boat's his baby. He takes care of it like you wouldn't believe. And they told him it's all shot up," Pizzuto said. "He's going to be heartbroken."